/*
 * Copyright 2024 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package com.linqingying.cangjie.resolve.lazy.declarations

import com.linqingying.cangjie.name.FqName
import com.linqingying.cangjie.name.Name
import com.linqingying.cangjie.psi.CjFile
import com.linqingying.cangjie.resolve.lazy.descriptors.AbstractPsiBasedDeclarationProvider
import com.linqingying.cangjie.storage.StorageManager


class FileBasedPackageMemberDeclarationProvider(
    storageManager: StorageManager,
    private val fqName: FqName,
    private val factory: FileBasedDeclarationProviderFactory,
    private val packageFiles: Collection<CjFile>
) : AbstractPsiBasedDeclarationProvider(storageManager), PackageMemberDeclarationProvider {

    private val allDeclaredSubPackages = storageManager.createLazyValue<Collection<FqName>> {
        factory.getAllDeclaredSubPackagesOf(fqName)
    }

    override fun doCreateIndex(index: Index) {
        for (file in packageFiles) {
            for (declaration in file.declarations) {
                assert(fqName == file.packageFqName) { "Files declaration utils contains file with invalid package" }
                index.putToIndex(declaration)
            }
        }
    }

    override fun getAllDeclaredSubPackages(nameFilter: (Name) -> Boolean): Collection<FqName> = allDeclaredSubPackages()

    override fun getPackageFiles() = packageFiles

    override fun containsFile(file: CjFile) = file in packageFiles

    override fun toString() = "Declarations for package $fqName with files ${packageFiles.map { it.name }} " +
            "with declarations inside ${packageFiles.flatMap { it.declarations }.map { it.name ?: "???" }}"
}
